Metal-Air ionic fluid batteries November 13, 2009
Posted by teknow in Batteries, Electricity, alternative Energy.add a comment
Professor Cody Friesen of Arizona State University thinks he can make a metal-air battery with up to 11 times the energy density of lithium batteries at potentially half the cost.
The Metal-Air Ionic Liquid battery that Friesen and his researchers are designing will use ionic liquids as its electrolytes, instead of water-based electrolytes. Ionic liquids are salts that remain liquid in sub-zero temperatures or above the boiling point of water. Metal-air batteries have typically relied on water-based electrolytes; but they fail prematurely due to water evaporation.
Finding an ionic liquid to use instead of water would solve the problems that restrict the energy density of batteries now. Water also has a relatively low electrochemical window: it starts to decompose when the cell exceeds 1.23 volts. Because ionic liquids have electrochemical stability windows of up to 5 volts; it allows you to use much more energy-dense metals than zinc. The research team will target energy densities of at least 900 watt-hours per kilogram and up to 1,600 watt-hours per kilogram.
Read in detail at gas2.org
Solar cells with 100% efficiency October 22, 2008
Posted by teknow in alternative Energy.Tags: alternative Energy, Solar Cells
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Researchers at Ohio State University have accidentally discovered a new solar cell material capable of absorbing all of the sun’s visible light energy. The material is comprised of a hybrid of plastics, molybdenum and titanium. The team discovered it not only fluoresces (as most solar cells do), but also phosphoresces. Electrons in a phosphorescent state remain at a place where they can be “siphoned off” as electricity over 7 million times longer than those generated in a fluorescent state. This combination of materials also utilizes the entire visible spectrum of light energy, translating into a theoretical potential of almost 100% efficiency. Commercial products are still years away, but this foundational work may well pave the way for a truly renewable form of clean, global energy.
source: http://www.tgdaily.com/html_tmp/content-view-39807-113.html
Toshiba to launch SciB batteries in March 2008 December 11, 2007
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Up to 90% charge in 5 minutes and lasting for over 10 years are the specs enough to overhaul the existing battery market.
Toshiba promises that kind of possibilities with the launch of their new batteries in March 2008. Some of the features of this revolutionary product are as follows :
| 1. High safety | |
| SCiB is difficult to cause the internal short circuit and the thermal runaway with the new cathode material and the adoption etc. of the electrolyte of the high flash point whose thermal safety is high, it is the electric battery whose possibility of explosion and ignition quite is low. | |
| 2. Long-lived efficiency | |
| After approximately 3000 charging and cycles due to quick charge condition, capacity decrease is under only 10%. Approximately, repetition charging and which exceeds 5000 times being possible, 10 years or more it can use over again with the charge of 1 day 1 time. | |
| 3. Boosting charge efficiency | |
| It can guarantee high safety and because heavy-current charge (50A) is possible, the SCiB cell, both standard module, it can complete the charge of 90% or more of battery capacity in 5 minutes. | |
| 4. Takaide power efficiency | |
| We have the input/output efficiency where like the electric double layer capacitor is high, it is optimum to the use whose big power is necessary. | |
| 5. Low temperature efficiency | |
| Minus 30 ℃ and sufficient discharge is possible with low temperature environment, it is suitable in the use where use at cold area is anticipated. | |
